The British broadcaster engaged in a "significant breach" of broadcasting rules by omitting to mention that the presenter of a programme about the Gaza situation was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
Ofcom has directed the BBC to air a evening announcement about its findings.
"Since this amounts to a significant violation of our rules, we are directing the corporation to air a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Possibility to Undermine Credibility'
The regulator's report declared: "Our probe determined that the film's failure to disclose that the presenter's parent occupied a role in the Hamas-administered government was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been highly relevant to their judgment of the narrator and the content he shared.
"Credibility is at the center of the connection between a broadcaster and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to undermine the significantly high amounts of confidence that audiences would have put in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in February after the narrator's familial connections were revealed, and in July an corporation's own inquiry concluded it infringed the organization's content policies on truthfulness.
A corporation official commented: "The regulator's decision is in accordance with the results of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will adhere to the directive as soon as the timing and wording are finalised."
